Black spots show up on patio slabs when mould and algae have taken root in the pores of the flags, so while it is possible to remove them, you're going to need the help of one of the best patio cleaners.
The patio black spots that grow on your garden stonework are actually spots of black lichen. The spores from the black lichen start life as tiny dust-like spores growing on the underside of leaves on trees and plants. These spores are carried, by the wind and the rain, onto your stonework in their millions.
Black spots, otherwise known as lichen, tend to appear when mould and algae have settled into the pores of the patio slabs.
As black spot causes problems by getting into pores, it is a bigger problem on stones that have larger pores as part of their structure. Stones that are often worse affected by black spot: Sandstone has a much more open texture with larger pores and is therefore much more likely to be affected by Black Spot.
And the answer is simple, find the right professional cleaning product and DIY. Stontex Black Spot Remover is a professional grade outdoor cleaner which eliminates all traces of stubborn grey lichen and black spots from all masonry and stone surfaces. This one off treatment eradicates black spots and algae with ease.
Simply put, black stains on flagstones are caused by certain types of mold and mildew. These fungi find their way onto the stones either from their spores landing on the stones or from simply extending onto the stones from patches of mold or mildew right beside them—a pretty common occurrence for garden pavers.
Sanding and chiselling will leave unsightly marks on your paving, bleaching can work well but you have to be careful not to kill your plants and dilute your bleach to the correct level, some people recommend using this method only in the winter months to avoid damage to plants but you still need to be really careful ...
Patio Magic contains a fungicide that will kill off the following: Lichens (mostly black spots, sometimes white, on patios, concrete and blocks). Mould. Algae.
Lichens are extremely tough to get rid of, so you'll need some specialist cleaning supplies to do the job. Look for a patio cleaner that contains sodium hypochlorite, also known as dairy bleach.
Patio Black Spot Remover is currently the only product developed specifically to safely remove those hideous black spots and restore the natural colour to garden stonework. Patio Black Spot Remover for Natural Stone will remove black lichen from all types of natural stone, including green algae and white fungi.
This is a common problem. It could either be mildew, or a reaction from tannin in the wood. Given that you have black residue on rocks, it may be mildew.
Combine 1 teaspoon of hydrogen peroxide and 1 teaspoon of milk in a glass bowl. Dip cotton pad or Q-tip in the bowl and apply to dark spots. Leave on for 15 minutes. Rinse with lukewarm water and finish off with your favorite serum and moisturizer.
It is common to mix bleach with water; however, you can also add other ingredients to make it more effective. Similar to cleaning pavers with muriatic acid, avoid an intense concentration of bleach, as it can damage the pavers.
Remove those ugly green and black mold stains on your deck with Wet & Forget Xtreme Reach™ Hose End. Spray your wood or composite deck with Wet & Forget no-rinse cleaner. Allow the surface to dry (4-5 hours). Let Mother Nature do the rest of the work for you!
How to Use Pro-Kleen Black Spot Remover. Apply the solution neat using a pump sprayer or a watering can. Leave for a minimum of 2 hours or overnight if possible. Keep children and pets away from the area during this time.
Cleaning your patio with bleach provides a little extra “oomph” over soapy water. Bleach gets into all the dirty cracks and helps to improve the appearance of your patio slabs dramatically. It can help you get rid of moss, algae and weeds. Cleaning a patio with bleach is easy once you know how, but it can be dangerous.
If allowed to set seed properly, black mould will continue to spread and grow. It attaches itself to natural materials both inside and outside the home, including natural wood, stone, wicker and paper materials.
Dalmatian Stone is white to gray jasper with black spots. It is given that name because white specimens have a color pattern similar to a Dalmatian dog. Dalmatian Stone is often dyed a variety of colors.
Mix bleach with water in a bucket, at an equal ratio. Make as much as you need for the whole area. After you've drenched the area in the bleach solution, work it into the Indian sandstone slabs with a brush, making sure to get right into the corners and gaps. Then leave it to soak for 15 minutes.
On granite, sandstone, slate, or quartzite, you can use a 1/2 teaspoon of hydrogen peroxide or a few drops of ammonia directly on the stain and remove it with a damp cloth. Use your normal cleaning solution on marble, limestone, onyx, or travertine.
If you are face with a very difficult oil stain that you cannot remove on the stone than baking soda may be one of the few options you have.
Salicylic acid
As a general rule, dark spots from acne benefit from using chemical exfoliators with salicylic acid because it not only helps with redness and irritation, but it also helps clear excess oil from your pores. Basically, a treatment and a cure.
Begin active treatments with Daconil® fungicide at the very first sign of disease to stop black spot and limit its damage.